21231220202313 has 128 divisors (see below), whose sum is σ = 33493222656000. Its totient is φ = 11825888256000.

The previous prime is 21231220202303. The next prime is 21231220202347. The reversal of 21231220202313 is 31320202213212.

It is not a de Polignac number, because 21231220202313 - 2⁵ = 21231220202281 is a prime.

It is a super-2 number, since 2×21231220202313² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21231220202303) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2775681913 + ... + 2775689561.

It is an arithmetic number, because the mean of its divisors is an integer number (261665802000).

Almost surely, 2^{21231220202313} is an apocalyptic number.

It is an amenable number.

21231220202313 is a deficient number, since it is larger than the sum of its proper divisors (12262002453687).

21231220202313 is a wasteful number, since it uses less digits than its factorization.

21231220202313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8663.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21231220202313 its reverse (31320202213212), we get a palindrome (52551422415525).

The spelling of 21231220202313 in words is "twenty-one trillion, two hundred thirty-one billion, two hundred twenty million, two hundred two thousand, three hundred thirteen".